Remove unnecessary section lookup by address when building COFF sections
Remove unnecessary section lookup by address when building COFF sections

In the decomposer, it is more straightforward/reliable to use the
section index we have, rather than recover it by address deeper down
the call stack.

R=chrisha@chromium.org
BUG=

Review URL: https://codereview.appspot.com/12936044

git-svn-id: db59699583a60be9a535cd09cdc9132301867226@1730 15e8cca8-e42c-11de-a347-f34a4f72eb7d

pombreda/syzygy,Eloston/syzygy,sebmarchand/syzygy,supriyantomaftuh/syzygy,google/syzygy,wangming28/syzygy,ericmckean/syzygy,Eloston/syzygy,ericmckean/syzygy,supriyantomaftuh/syzygy,ericmckean/syzygy,sebmarchand/syzygy,google/syzygy,ericmckean/syzygy,supriyantomaftuh/syzygy,wangming28/syzygy,pombreda/syzygy,supriyantomaftuh/syzygy,wangming28/syzygy,pombreda/syzygy,google/syzygy,pombreda/syzygy,pombreda/syzygy,wangming28/syzygy,sebmarchand/syzygy,sebmarchand/syzygy,google/syzygy,sebmarchand/syzygy,ericmckean/syzygy